#include "StdAfx.h"
#include "CvvImage.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CV_INLINE RECT NormalizeRect( RECT r );
CV_INLINE RECT NormalizeRect( RECT r )
{
 int t;
 if( r.left > r.right )
 {
  t = r.left;
  r.left = r.right;
  r.right = t;
 }
 if( r.top > r.bottom )
 {
  t = r.top;
  r.top = r.bottom;
  r.bottom = t;
 }
 return r;
}
CV_INLINE CvRect RectToCvRect( RECT sr );
CV_INLINE CvRect RectToCvRect( RECT sr )
{
 sr = NormalizeRect( sr );
 return cvRect( sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top );
}
CV_INLINE RECT CvRectToRect( CvRect sr );
CV_INLINE RECT CvRectToRect( CvRect sr )
{
 RECT dr;
 dr.left = sr.x;
 dr.top = sr.y;
 dr.right = sr.x + sr.width;
 dr.bottom = sr.y + sr.height;
 return dr;
}
CV_INLINE IplROI RectToROI( RECT r );
CV_INLINE IplROI RectToROI( RECT r )
{
 IplROI roi;
 r = NormalizeRect( r );
 roi.xOffset = r.left;
 roi.yOffset = r.top;
 roi.width = r.right - r.left;
 roi.height = r.bottom - r.top;
 roi.coi = 0;
 return roi;
}
void  FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin )
{
 assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));
 BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);
 memset( bmih, 0, sizeof(*bmih));
 bmih->biSize = sizeof(BITMAPINFOHEADER);
 bmih->biWidth = width;
 bmih->biHeight = origin ? abs(height) : -abs(height);
 bmih->biPlanes = 1;
 bmih->biBitCount = (unsigned short)bpp;
 bmih->biCompression = BI_RGB;
 if( bpp == 8 )
 {
  RGBQUAD* palette = bmi->bmiColors;
  int i;
  for( i = 0; i < 256; i++ )
  {
   palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i;
   palette[i].rgbReserved = 0;
  }
 }
}
CvvImage::CvvImage()
{
 m_img = 0;
}
void CvvImage::Destroy()
{
 cvReleaseImage( &m_img );
}
CvvImage::~CvvImage()
{
 Destroy();
}
bool  CvvImage::Create( int w, int h, int bpp, int origin )
{
 const unsigned max_img_size = 10000;
 if( (bpp != 8 && bpp != 24 && bpp != 32) ||
  (unsigned)w >=  max_img_size || (unsigned)h >= max_img_size ||
  (origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL))
 {
  assert(0); // most probably, it is a programming error
  return false;
 }
 if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h )
 {
  if( m_img && m_img->nSize == sizeof(IplImage))
   Destroy();
  
  m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 );
 }
 if( m_img )
  m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL;
 return m_img != 0;
}
void  CvvImage::CopyOf( CvvImage& image, int desired_color )
{
 IplImage* img = image.GetImage();
 if( img )
 {
  CopyOf( img, desired_color );
 }
}

#define HG_IS_IMAGE(img)                                                  \
 ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && \
 ((IplImage*)img)->imageData != 0)

void  CvvImage::CopyOf( IplImage* img, int desired_color )
{
 if( HG_IS_IMAGE(img) )
 {
  int color = desired_color;
  CvSize size = cvGetSize( img );
  if( color < 0 )
   color = img->nChannels > 1;
  if( Create( size.width, size.height,
   (!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8,
   img->origin ))
  {
   cvConvertImage( img, m_img, 0 );
  }
 }
}

bool  CvvImage::Load( const char* filename, int desired_color )
{
 IplImage* img = cvLoadImage( filename, desired_color );
 if( !img )
  return false;
 CopyOf( img, desired_color );
 cvReleaseImage( &img );
 return true;
}

bool  CvvImage::LoadRect( const char* filename,
       int desired_color, CvRect r )
{
 if( r.width < 0 || r.height < 0 ) return false;
 IplImage* img = cvLoadImage( filename, desired_color );
 if( !img )
  return false;
 if( r.width == 0 || r.height == 0 )
 {
  r.width = img->width;
  r.height = img->height;
  r.x = r.y = 0;
 }
 if( r.x > img->width || r.y > img->height ||
  r.x + r.width < 0 || r.y + r.height < 0 )
 {
  cvReleaseImage( &img );
  return false;
 }
 
 if( r.x < 0 )
 {
  r.width += r.x;
  r.x = 0;
 }
 if( r.y < 0 )
 {
  r.height += r.y;
  r.y = 0;
 }
 if( r.x + r.width > img->width )
  r.width = img->width - r.x;
 if( r.y + r.height > img->height )
  r.height = img->height - r.y;
 cvSetImageROI( img, r );
 CopyOf( img, desired_color );
 cvReleaseImage( &img );
 return true;
}

bool  CvvImage::Save( const char* filename )
{
 if( !m_img )
  return false;
 cvSaveImage( filename, m_img );
 return true;
}

void  CvvImage::Show( const char* window )
{
 if( m_img )
  cvShowImage( window, m_img );
}

void  CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y )
{
 if( m_img && m_img->depth == IPL_DEPTH_8U )
 {
  uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
  BITMAPINFO* bmi = (BITMAPINFO*)buffer;
  int bmp_w = m_img->width, bmp_h = m_img->height;
  FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );
  from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 );
  from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 );
  int sw = MAX( MIN( bmp_w - from_x, w ), 0 );
  int sh = MAX( MIN( bmp_h - from_y, h ), 0 );
  SetDIBitsToDevice(
   dc, x, y, sw, sh, from_x, from_y, from_y, sh,
   m_img->imageData + from_y*m_img->widthStep,
   bmi, DIB_RGB_COLORS );
 }
}

void  CvvImage::DrawToHDC( HDC hDCDst, RECT* pDstRect )
{
 if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData )
 {
  uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
  BITMAPINFO* bmi = (BITMAPINFO*)buffer;
  int bmp_w = m_img->width, bmp_h = m_img->height;
  CvRect roi = cvGetImageROI( m_img );
  CvRect dst = RectToCvRect( *pDstRect );
  if( roi.width == dst.width && roi.height == dst.height )
  {
   Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y );
   return;
  }
  if( roi.width > dst.width )
  {
   SetStretchBltMode(
    hDCDst,           // handle to device context
    HALFTONE );
  }
  else
  {
   SetStretchBltMode(
    hDCDst,           // handle to device context
    COLORONCOLOR );
  }
  FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );
  ::StretchDIBits(
   hDCDst,
   dst.x, dst.y, dst.width, dst.height,
   roi.x, roi.y, roi.width, roi.height,
   m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY );
 }
}

void  CvvImage::Fill( int color )
{
 cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );
}